Marginal zone lymphoma is divided into three distinct categories.
All three are indolent lymphomas.
Nodal marginal zone lymphoma is also known as Monocytoid B-cell Lymphoma. It is a very rare entity. This lymphoma involves the lymph nodes, and is treated very much the same as similarly staged follicular lymphoma. It is an indolent variety of lymphoma but behaves slightly more aggressively than MALT lymphomas. Because it is so rare it is difficult to find much information about this type of lymphoma. Here are a few links that give more information.
Optimizing therapy for nodal marginal zone lymphoma
This one is a very thorough review of how it is diagnosed, recognized, distinguished from other lymphoma and treated.
Recognizing nodal marginal zone lymphoma: recent advances and pitfalls. A systematic review
Next is an excellent overview of the non-gastric forms of marginal zone lymphoma.
Non-gastric marginal zone B cell lymphoma: clinicopathologic features and treatment results
A somewhat technical discussion of Nodal Marginal Zone Lymphoma
Focused search for nodal marginal zone lymphoma from PubMED
Extranodal marginal zone lymphomas are lymphomas that involve the Mucosa Associated Lymphoid Tissues, and thus are called MALT lymphoma. The stomach is the site most often involved, but other sites of involvement can be; gastrointestinal tract, thyroid, lung, breast, eye orbit, and skin.
MALT of the stomach can often be completely resolved by treating for the Helicobactor-Pylori infection. In the presence of Hepatitis C Virus (HCV) infection, treatment with Interferon Alfa with or without ribavirin often results in a complete or partial remission.
When chemotherapy is required, a Fludarabine based regimen often achieves very high response rates, as is so with splenic marginal zone lymphoma. See the study below.
The spectrum of MALT lymphoma at different sites: biological and therapeutic relevance
Articles about MALT lymphoma from the Journal Blood
Click here for more detailed information about MALT from Medscape
A rare form of MALT lymphoma is MALT of the ocular adnexa. That refers to the appendages of the eye, such as the muscles, eye lids, and tear ducts. Here is a link to an article from the Journal Blood, which thoroughly discusses the features, outcome and treatment of MALT of the ocular adnexa.